Texas Instruments TLV75528PDQNT

Overview

TLV75528PDQNT from Texas Instruments is a 500mA, low-quiescent-current (25μA typ), fixed 2.8V output LDO regulator in a 1mm × 1mm X2SON-4 package. It operates from 1.45V to 5.5V input, delivers ±1% output accuracy at 85°C, features active output discharge and built-in soft-start, and is optimized for space-constrained battery-powered microcontroller core supplies.

For engineers reviewing the TLV75528PDQNT datasheet, TLV75528PDQNT pinout, TLV75528PDQNT application, or TLV75528PDQNT equivalent, key selection criteria include dropout voltage (238mV max at 500mA/3.3VOUT), PSRR (46dB at 100kHz), thermal resistance (168.4°C/W JEDEC RθJA for DQN), stability with 1µF ceramic output capacitor, and enable pin logic thresholds (VHI = 1V, VLO = 0.3V).

Technical Context

The TLV75528PDQNT uses a PMOS pass transistor architecture enabling ultra-low dropout and high PSRR across 1kHz–1MHz. Its internal bandgap reference and error amplifier deliver 1% output accuracy over temperature, while foldback current limiting and thermal shutdown (165°C trip) provide fault protection without external components.

It integrates an active pulldown resistor (120Ω) on the OUT pin during shutdown for rapid discharge, and its enable circuitry supports direct connection to VIN when shutdown is unnecessary. The device maintains regulation stability with minimal 1µF ceramic output capacitance due to inherent phase margin design.

Key Specifications

Pinout & Package

TLV75528PDQNT is housed in a 1mm × 1mm, 4-pin X2SON (DQN) package with wettable flanks and no exposed thermal pad. The package is lead-free, RoHS-compliant, and optimized for automated optical inspection (AOI) and reflow soldering.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar LDO regulator applications.

Compared with TPL7407LPGQDR and TPS7A0528PDBVR, TLV75528PDQNT uniquely balances 500mA capability, 25μA IQ, and 1mm × 1mm packaging - making it the only viable option for space-constrained, battery-powered MCU systems needing full-core current at 2.8V.

Availability

TLV75528PDQNT is available at Aetrix Electronics and suitable for wearable health sensors, industrial IoT edge nodes, smart home hub controllers, and portable diagnostic equipment requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for TLV75528PDQNT includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Texas Instruments is a global semiconductor leader specializing in analog and embedded processing technologies, with decades of LDO design expertise and broad automotive, industrial, and personal electronics market presence.

The TLV755P family was engineered specifically for ultra-compact, battery-sensitive applications demanding high accuracy, low dropout, and minimal external components - targeting next-generation wearables, IoT endpoints, and portable medical devices.

FAQ

What is the maximum output current capability of the TLV75528PDQNT?

The TLV75528PDQNT delivers up to 500mA of continuous output current under normal operating conditions. Its foldback current limit activates when output voltage drops below 0.4×VOUT(NOM), reducing current during short-circuit events to limit thermal stress. At 2.8V output, the device sustains full 500mA load with ≤238mV dropout when input is ≥3.038V and junction temperature remains below 125°C.

Does TLV75528PDQNT require an external capacitor on the EN pin?

No, TLV75528PDQNT does not require an external capacitor on the EN pin. Its enable circuitry draws only 10nA typical leakage current and has defined logic thresholds (VHI = 1V, VLO = 0.3V). However, if EN is driven from a high-impedance source or noisy environment, a small 100pF capacitor to ground may improve noise immunity - but this is not specified in the datasheet and is application-dependent.

Can TLV75528PDQNT operate with a 1µF output capacitor?

Yes, TLV75528PDQNT is explicitly designed to be stable with a minimum 1µF ceramic output capacitor - a key differentiator versus older LDOs requiring 10–22µF. This value meets the 0.47µF nominal requirement (50% derated) and ensures adequate phase margin across temperature and load. X5R or X7R dielectrics are recommended to maintain effective capacitance under DC bias.

What is the thermal resistance (RθJA) of TLV75528PDQNT in its X2SON-4 package?

The TLV75528PDQNT in the DQN (X2SON-4) package has a JEDEC-standard RθJA of 168.4°C/W. This value assumes a 2-layer PCB with no thermal vias per JEDEC JESD51-2. In practice, adding two or more thermal vias under the exposed pad (though DQN has no thermal pad) or increasing copper area can reduce effective RθJA - but the 168.4°C/W rating defines worst-case junction-to-ambient rise under standard test conditions.

How does TLV75528PDQNT handle output discharge during shutdown?

TLV75528PDQNT features active output discharge via an internal 120Ω pulldown resistor connected between OUT and GND when the EN pin is pulled low. This rapidly discharges the output capacitor, ensuring the downstream circuit reaches a known 0V state before the next power-up cycle - critical for reliable reset behavior in microcontroller-based systems. Discharge time depends on COUT and parallel load resistance per τ = (120·RL)/(120+RL)·COUT.